Fe 2 O 3 enhanced high-temperature arsenic resistance of CeO 2 -La 2 O 3 /TiO 2 catalyst for selective catalytic reduction of NO x with NH 3 .

High-temperature arsenic resistance catalysts of CeLa 0.5 Fe x /Ti ( x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) series were prepared and measured under a simulation condition of arsenic poisoning. The as-prepared catalysts were characterized by XRD, SEM, TEM, and XPS. The specific surface area and pore size of the catalysts were measured. At x = 0.2, the catalyst shows the best arsenic resistance and catalytic performance. The active temperature range of the CeLa 0.5 Fe 0.2 /Ti catalyst is 345-520 °C when the gas hourly space velocity is up to 225 000 mL g -1 h -1 . Compared with commercial vanadium-based catalysts, CeLa 0.5 Fe 0.2 /Ti shows much better catalytic performance. The introduction of Fe will improve the dispersion of CeO 2 and increase the concentration of Ce 3+ and unsaturated active oxygen on the surface. The NH 3 -TPD and H 2 -TPR results show that the CeLa 0.5 Fe 0.2 /Ti catalyst has more acidic sites and more excellent redox performance than CeLa 0.5 Fe 0 /Ti. The CeLa 0.5 Fe 0.2 /Ti catalyst might have application prospects in the field of selective catalytic reduction of NO x with NH 3 .